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127 lines
4.7 KiB
127 lines
4.7 KiB
/**************************************************************************** |
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* sched/work_cancel.c |
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* |
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* Copyright (C) 2009-2010, 2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#include <queue.h> |
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#include <assert.h> |
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#include <errno.h> |
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#include <debug.h> |
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#include <nuttx/arch.h> |
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#include <nuttx/wqueue.h> |
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#include "work_internal.h" |
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#ifdef CONFIG_SCHED_WORKQUEUE |
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/**************************************************************************** |
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* Pre-processor Definitions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Type Declarations |
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****************************************************************************/ |
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/**************************************************************************** |
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* Public Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: work_cancel |
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* |
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* Description: |
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* Cancel previously queued work. This removes work from the work queue. |
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* After work has been canceled, it may be re-queue by calling work_queue() |
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* again. |
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* |
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* Input parameters: |
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* qid - The work queue ID |
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* work - The previously queue work structure to cancel |
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* |
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* Returned Value: |
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* Zero on success, a negated errno on failure |
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* |
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****************************************************************************/ |
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int work_cancel(int qid, FAR struct work_s *work) |
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{ |
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FAR struct wqueue_s *wqueue = &g_work[qid]; |
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irqstate_t flags; |
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DEBUGASSERT(work != NULL && (unsigned)qid < NWORKERS); |
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/* Cancelling the work is simply a matter of removing the work structure |
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* from the work queue. This must be done with interrupts disabled because |
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* new work is typically added to the work queue from interrupt handlers. |
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*/ |
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flags = irqsave(); |
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if (work->worker != NULL) |
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{ |
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/* A little test of the integrity of the work queue */ |
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DEBUGASSERT(work->dq.flink ||(FAR dq_entry_t *)work == wqueue->q.tail); |
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DEBUGASSERT(work->dq.blink ||(FAR dq_entry_t *)work == wqueue->q.head); |
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/* Remove the entry from the work queue and make sure that it is |
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* mark as availalbe (i.e., the worker field is nullified). |
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*/ |
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dq_rem((FAR dq_entry_t *)work, &wqueue->q); |
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work->worker = NULL; |
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} |
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irqrestore(flags); |
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return OK; |
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} |
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#endif /* CONFIG_SCHED_WORKQUEUE */
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